Geodesic
On the number of limit cycles of equation $\frac{dy}{dx}=\frac{P(x,y)}{Q(x,y)}$, in which~$P$ and~$Q$
Doklady Akademii Nauk, Tome 113 (1957) no. 4, pp. 748-751

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     author = {E. M. Landis and I. G. Petrovskii},
     title = {On the number of limit cycles of equation $\frac{dy}{dx}=\frac{P(x,y)}{Q(x,y)}$, in which~$P$ and~$Q$},
     journal = {Doklady Akademii Nauk},
     pages = {748--751},
     publisher = {mathdoc},
     volume = {113},
     number = {4},
     year = {1957},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1957_113_4_a6/}
}
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E. M. Landis; I. G. Petrovskii. On the number of limit cycles of equation $\frac{dy}{dx}=\frac{P(x,y)}{Q(x,y)}$, in which~$P$ and~$Q$. Doklady Akademii Nauk, Tome 113 (1957) no. 4, pp. 748-751. http://geodesic.mathdoc.fr/item/DAN_1957_113_4_a6/